JP5410624B2 - Slide fastener - Google Patents

Description

  The present invention relates to a slide fastener in which a plurality of synthetic resin-made fastener elements are arrayed by injection molding at opposite tape side edge portions of a pair of left and right fastener tapes. The present invention relates to a slide fastener having a shape that looks like a made fastener element.

  Conventionally, as fastener elements used for slide fasteners, synthetic resin fastener elements that are formed individually by injection molding synthetic resin onto a fastener tape, and monofilaments are molded into a coil or zigzag shape. A continuous fastener element formed by doing this, a metal fastener element formed by crimping a metal element material having a substantially Y shape on a fastener tape, and the like are known.

  The synthetic resin fastener element is generally formed so as to straddle the first surface that is the outer surface of the fastener tape and the second surface that is the back surface of the tape, and on the element disposed on the first surface side of the fastener tape. It has a half part and an element lower half part arranged on the second surface side of the fastener tape.

  In addition, such a synthetic resin fastener element is often formed so that the upper half of the element and the lower half of the element have a symmetrical shape. For example, the aesthetics and feel of the fastener element (hand feel) In some cases, the upper half of the element and the lower half of the element are formed in different asymmetric shapes.

  Examples of fastener elements in which the upper half of the element and the lower half of the element have different shapes are disclosed in, for example, Japanese Utility Model Publication No. 45-33956 (Patent Document 1) and Japanese Patent Publication No. 47-37061 (Patent Document 2). ), And Japanese Patent Application Laid-Open No. 2006-320642 (Patent Document 3).

  For example, the synthetic resin fastener element 51 described in Patent Document 1 includes an element upper half 53 arranged on the first surface side of the fastener tape 52 and the fastener tape as shown in FIG. 52, the lower half portion 54 of the element disposed on the second surface side, and the upper half portion 53 of the element includes a first tape clamping portion 53a having a substantially rectangular shape in front view and the first tape. A triangular head formed in a triangular shape extending from the clamping portion 53a toward the outside of the tape and gradually decreasing in the tape length direction (hereinafter referred to as the element width dimension) toward the tip. 53b.

  The lower half portion 54 of the fastener element 51 has a second tape clamping portion that clamps the fastener tape 52 between the first tape clamping portion 53a and the second tape clamping portion toward the outside of the tape. A neck portion 54a that extends and has a shape constricted in the element width direction is provided, and a meshing head portion 54b that extends enormously from the tip of the neck portion 54a.

  In particular, in the fastener element 51 of Patent Document 1, the upper surface of the element upper half 53 and the lower surface of the element lower half 54 are formed on a continuous flat surface, and the triangular shape of the element upper half 53 is also provided. The thickness (vertical dimension) of the head 53b is set to be thinner than the thickness of the meshing head 54b of the lower half 54 of the element.

  According to Patent Document 1, the slide fastener 50 is configured using the fastener element 51 as described above, whereby the thickness of the entire fastener element 51 can be reduced, and the triangular head 53b Since a part of the meshing head 54b of the mating counterpart can be covered with the side edge portion, it is said that strong meshing that hardly causes chain cracking is obtained.

  Next, the synthetic resin fastener element 61 described in Patent Document 2 has an element upper half 62 and an element lower half 63 as shown in FIGS. 13 and 14. The element upper half 62 of each fastener element 61 has a substantially trapezoidal shape when viewed from the front, and a first tape holding part 62a for holding a fastener tape between the element lower half 63 and the first tape holding part. A neck portion 62b extending outward from the tape 62a and a meshing head portion 62c extending enormously from the tip of the neck portion 62b are provided. Moreover, in this patent document 2, the meshing head part 62c of the element upper half part 62 is formed so that the cross-sectional shape may become a semicircle shape.

  On the other hand, the lower half portion 63 of the fastener element 61 has only a substantially trapezoidal second tape holding portion 63a arranged so as to correspond to the first tape holding portion 62a and the neck portion 62b of the upper half portion 62 of the element. The space below the meshing head 62c of the element upper half 62 is a space where nothing is formed.

  In the case of the slide fastener 60 of Patent Document 2 having the fastener element 61 as described above, since the meshing head 62c of the element upper half 62 has a semicircular cross section, the left and right fastener elements 61 are In the engaged state, the fastener tape 64 can be easily folded to the element upper half 62 side with a small radius of curvature. In addition, according to Patent Document 2, in the folded state of the fastener tape 64, the tape inner end of the first tape clamping portion 62a of each fastener element 61 is formed wider than the meshing head 62c. The left and right fastener elements 61 can be prevented from being disengaged.

  The synthetic resin fastener element 71 described in Patent Document 3 has an element upper half 72 and an element lower half 73 as shown in FIG. The upper half 72 has a substantially rectangular first tape holding portion 72a in a front view, and extends from the first tape holding portion 72a toward the outside of the tape. The element width dimension gradually decreases toward the tip. And a triangular head 72b formed in a triangular shape.

  Further, the lower half portion 73 of the fastener element 71 includes a second tape holding portion 73a for holding the fastener tape 74 between the first tape holding portion 72a and a tape outward from the second tape holding portion 73a. A neck portion 73b extending toward the head, and a meshing head portion 73c extending enormously from the tip of the neck portion 73b.

  Further, in the fastener element 71, the upper surface of the element upper half 72 is curved so that the central part in the element width direction and the central part in the element length direction are convex upward. On the other hand, the lower surface of the lower half portion 73 of the element is formed in a flat plane.

  In the case of the slide fastener 70 having such a fastener element 71 of Patent Document 3, since the upper surface of the element upper half 72 has a curved surface that bulges in a gentle arc shape, the feel and feel of the fastener element 71 are improved. It becomes favorable and the aesthetics of the element row can be improved.

Japanese Utility Model Publication No. 45-33956 Japanese Patent Publication No. 47-37061 JP 2006-320642 A

  Since the synthetic resin fastener element as described above is directly fixed to the fastener tape at the time of injection molding, the fixing area of the fastener element with respect to the fastener tape is increased to increase the fixing strength of the fastener element. The fixed state of the fastener element is stabilized. For this reason, in the conventional synthetic resin fastener elements as described in Patent Documents 1 to 3, in order to stably secure the fixing strength of the fastener elements, the element width dimension of each fastener element is set. I had to set it large.

  By the way, since the metal fastener element used for the slide fastener is planted and fixed to the fastener tape by being crimped, the element width dimension of the fastener element is similar to that of the synthetic resin fastener element as described above. Even if it is not set large, sufficient fixing strength can be easily obtained.

  For this reason, the element width dimension of a metal fastener element is generally set smaller than that of a synthetic resin fastener element, and a slide fastener to which such a metal fastener element is fixed is made of a synthetic resin. It often looks more stylish and gives a stylish impression than a slide fastener having a fastener element, and is superior in appearance quality (appearance).

  However, such a metal fastener element is heavier than a synthetic resin fastener element, so that a slide fastener in which a plurality of metal fastener elements are arranged becomes heavy. Therefore, the slide fastener having such a metal fastener element has a problem that although it is excellent in appearance quality, it is difficult to be used for clothing that requires lightness, and its application is limited.

  The present invention has been made in view of the above-described conventional problems, and a specific object thereof is excellent in appearance quality like a metal fastener element and is lighter than a metal fastener element. Another object of the present invention is to provide a slide fastener having a simple fastener element, and further to provide a slide fastener that is functionally superior in that it is difficult to cause meshing cracks.

In order to achieve the above object, a slide fastener provided by the present invention is basically made of a synthetic resin lined up at a pair of left and right fastener tapes and opposite tape side edges of the fastener tape. A plurality of fastener elements, and each fastener element includes an upper half of an element disposed on the first surface side of the fastener tape, and a lower half of the element disposed on the second surface side of the fastener tape. The upper half of the element has a first tape clamping portion having a predetermined tape length dimension, and extends from the first tape clamping portion to the tip of the lower half of the element toward the outside of the tape. And a taper-shaped first head whose dimension in the tape length direction gradually decreases toward the tip thereof, and the lower half of the element is located between the first tape sandwiching portion and the first tape holding portion. A second tape holding portion for holding the tape, a neck portion extending from the second tape holding portion toward the outside of the tape and constricted in the longitudinal direction of the tape, and extending from the tip portion of the neck portion A slide fastener provided with a second head that swells forward and backward in the tape length direction, wherein the first head includes a first narrow portion disposed on the first tape clamping portion side; The main feature is that the first narrow width portion has a second narrow width portion disposed on the tip side of the element via the inflection portion.

  In the slide fastener according to the present invention, when the upper half of the element is bent in a direction in which the upper half of the elements approach each other with the left and right fastener elements engaged, the first head The first head and the mating counterpart side so as to avoid the second heads adjacent to each other on the meshing counterpart side from separating due to interference with the upper half of the element on the meshing counterpart side It is preferable to have an interference avoidance part for avoiding interference with the upper half of the element.

  In this case, the interference avoiding portion has a height dimension in the vertical direction of the fastener element that is higher than a height dimension at the thin-wall starting portion from the thin-wall starting portion set in the upper half of the element to the first head side. It is preferable that it is formed by having a small thinned portion.

  Further, it is preferable that the thin portion has a downward inclined surface that is inclined downward so as to gradually reduce the height dimension of the fastener element from the thin-wall start portion toward the tip of the first head. In particular, it is preferable that an inclination angle of the downward inclined surface with respect to the upper surface on the tape inner side of the thin-wall start portion in the upper half of the element is set to 15 ° or more and less than 90 °.

  Furthermore, the height dimension of the fastener element at the tip of the first head is set to be greater than 50% and 80% or less of the height dimension of the fastener element at the position where the thin-walled start portion is disposed. Preferably it is. Furthermore, it is preferable that the dimension in the tape width direction from the tip of the first head to the thin-wall start part is set to 45% or more of the length dimension of the entire fastener element.

  In the slide fastener of the present invention, it is preferable that an inner angle at a tip portion of the first head is set to 30 ° or less. Furthermore, the second narrow width portion is recessed inwardly of the straight line when the side edge at the base end of the first head and the side edge at the tip of the first head are connected by a straight line. It is preferable to be formed as described above.

  In the slide fastener according to the present invention, the synthetic resin fastener element fixed to the fastener tape includes an element upper half and an element lower half, and the element upper half includes a first tape holding portion and And a taper-shaped first head portion extending outward from the first tape clamping portion, and the lower half of the element includes a second tape clamping portion, a neck portion having a constricted shape, Second head. Furthermore, the first head of the upper half of the element has a first narrow portion disposed on the first tape clamping portion side, and a first narrow portion disposed on the element tip side from the first narrow portion via the inflection portion. And two narrow portions.

  The slide fastener of the present invention having such a synthetic resin fastener element can be reduced in weight compared to a slide fastener having a metal fastener element. Further, since the first head of the upper half of the element is formed as described above, the appearance of the fastener element can be brought close to the metal fastener element. For this reason, the fastener element can have excellent appearance quality that gives a stylish feeling and a stylish impression like a metal fastener element. Further, when the left and right fastener elements are engaged, even if the fastener element receives a pushing force from below to above, the first narrow portion supports the second head of the mating counterpart, and the fastener element The meshing state can be stably maintained.

  In such a slide fastener of the present invention, the upper half of the element meshes with the first head when the fastener tape is folded in a direction in which the upper half of the elements approach each other with the left and right fastener elements engaged. It has an interference avoidance unit that avoids interference with the upper half of the element on the other side.

  For example, in the case of a slide fastener having a conventional synthetic resin fastener element in which the taper portion of the present invention is not provided in the first tape clamping portion of the fastener element, the upper half of the element of each fastener element has a tape length It is widely formed in the vertical direction (element width direction), and the distance on the element upper surface side between adjacent fastener elements is set to be relatively small.

  For this reason, the slide fastener is folded in a direction in which the upper half of the elements approach each other in a state where the left and right fastener elements are engaged, that is, in a state where the lower half portions of the left and right fastener elements are engaged. When the fastener tape is bent to a certain radius of curvature, the front edge and the rear edge on the upper surface side of the first tape clamping portion abut between adjacent fastener elements.

  For this reason, the fastener tape is restricted from being bent to a smaller radius of curvature, and as a result, the distance between the second heads of the lower half of the adjacent elements on the second surface side of the fastener tape is predetermined. Since it does not expand larger than the size, it was possible to prevent the right and left fastener elements from being disengaged.

  However, in the case of the slide fastener in which the taper portion is formed in the first tape clamping portion of the fastener element as in the present invention, the pitch of the fastener element fixed to the fastener tape is not different from the conventional one, but the first of each fastener element is the same. The dimension of the tape length direction in the upper surface part of 1 tape clamping part becomes small. For this reason, the space | interval in the element upper surface side between the mutually adjacent fastener elements inevitably becomes wider than the conventional slide fastener.

  For this reason, the slide fastener of the present invention is the conventional fastener tape when the fastener tape is folded in a direction in which the upper half portions of the elements approach each other with the lower half portions of the left and right fastener elements engaged with each other. Easily bends to a smaller radius of curvature than slide fasteners. At this time, between the adjacent fastener elements, the first head of the upper half of the element interferes with the upper half of the element on the mating counterpart side before the first tape clamping portions come into contact with each other.

  Thus, when the fastener tape in the slide fastener of the present invention is bent to a radius of curvature smaller than the conventional one, if the first head of the upper half of the element interferes with the upper half of the element on the mating counterpart side, the interference Since the lower portion of the fastener elements adjacent to each other on the meshing partner side turns away from each other as a fulcrum, the interval between the second heads of the fastener element is easier than a predetermined size. It will spread greatly. As a result, the lower half of the left and right elements cannot be maintained in meshing state, and the right and left fastener elements are disengaged.

  Therefore, in the present invention, the above-described interference avoiding portion is provided in the upper half of the element in order to improve the problem of chain cracking caused by forming the tapered portion in the first tape clamping portion of the fastener element.

Thereby, when the fastener tape is folded in a state where the left and right fastener elements are engaged with each other, even if the fastener tape is bent to a smaller radius of curvature than the conventional, the first head and the upper half of the element on the engagement counterpart side Therefore, it is possible to prevent the fastener element from rotating in the direction of separating from the interference portion as a fulcrum. As a result, the distance between the second heads of the fastener elements does not expand more than a predetermined size, so that the engagement of the left and right fastener elements can be prevented and the meshing state can be maintained stably. it can.

  In this case, the interference avoiding part is a thin part in which the height dimension in the vertical direction of the fastener element is smaller than the height dimension at the thin part starting part from the thin part starting part set in the upper half of the element to the first head side. It is formed by having. Thereby, when the fastener tape is folded in a direction in which the upper half portions of the elements approach each other in the meshing state of the fastener element, interference between the first head portion and the upper half portion of the mating counterpart side is surely avoided. Can do.

  At this time, the thin portion has a downwardly inclined surface inclined downward so as to gradually reduce the height dimension of the fastener element from the thinned start portion toward the tip of the first head. Thereby, the above-mentioned interference avoidance part can be easily provided in the upper half of the element without deteriorating the appearance quality of the fastener element.

  Particularly in this case, the inclination angle of the downward inclined surface with respect to the upper surface on the inner side of the tape from the thin-wall start portion in the upper half of the element is set to 15 ° or more and less than 90 °, preferably 20 ° or more and 45 ° or less. . When the inclination angle is 15 ° or more, particularly 20 ° or more, the interference avoiding portion can more reliably avoid interference between the first head and the upper half of the element on the mating counterpart side. Further, when the inclination angle is less than 90 °, particularly 45 ° or less, the appearance quality of the fastener element is not deteriorated.

  In the fastener element of the present invention, the height dimension of the fastener element at the tip of the first head is set to be greater than 50% and less than 80% of the height dimension of the fastener element at the position where the thin-walled start portion is disposed. Has been.

  By setting the height at the tip of the first head to be greater than 50%, preferably 60% or more of the height at the thin-walled starting portion, the first head is sure to reach the tip of the lower half of the element. Therefore, the appearance quality of the fastener element is not deteriorated. In addition, since the height dimension at the tip of the first head is set to 80% or less, preferably 75% or less of the height dimension at the thin-wall start part, the interference avoiding part meshes with the first head. Interference with the upper half of the side element can be avoided more reliably.

  Furthermore, in the fastener element of the present invention, the dimension in the tape width direction from the tip of the first head to the thin-wall start portion is set to 45% or more of the length dimension of the entire fastener element. Thereby, interference with a 1st head and the element upper half part of a meshing other party can be avoided more reliably in an interference avoidance part.

  In the slide fastener according to the present invention, it is preferable that the taper angle of the taper portion of each fastener element is set to 5 ° or more, particularly 10 ° or more. Furthermore, the maximum value of the dimension in the tape length direction (element width dimension) on the upper surface of the first tape clamping part of each fastener element is 70% of the maximum value of the dimension in the tape length direction of the first tape clamping part. Is preferably set to be small.

Thus, the taper angle of the taper portion is set to 5 ° or more, and the maximum value of the tape length direction dimension on the upper surface of the first tape clamping portion is the dimension in the tape length direction of the first tape clamping portion. By setting it to be smaller than 70% of the maximum value, the dimension in the tape length direction on the upper surface side of the first tape clamping portion is reduced, and each fastener element fixed to the fastener tape is replaced with a metal fastener. It can be finished like an element.

  The taper angle in the present invention refers to the inclination angle of the taper surface with respect to the vertical direction of the element, for example, when the taper surface constituting the taper portion is a flat surface, and the taper surface is a curved surface. When formed, it indicates the inclination angle of the tangent at the lower end of the curved surface with respect to the vertical direction of the element.

  In the slide fastener according to the present invention, the inner angle at the tip of the first head is set to 30 ° or less, preferably 20 ° or less. Thereby, the external appearance of each fastener element can be made to look more like a metal fastener element.

  Furthermore, when the second narrow part in the first head of the upper half of the element connects the side edge at the base end of the first head and the side edge at the tip of the first head with a straight line, It is formed so as to be recessed inward from the straight line. As a result, the element width dimension (dimension in the tape length direction) of the second narrow width part from the tip of the first head to the inflection part becomes small. It is possible to more effectively prevent the first head from interfering with the upper half of the element on the mating counterpart side when folded in the direction in which they approach each other.

  Further, the maximum value in the tape length direction of the second head of each fastener element is set to 85% to 95% of the maximum value in the tape length direction of the second tape clamping portion. Is preferred.

  The maximum value of the dimension in the tape length direction in the second head is set to 85% or more of the maximum value of the dimension of the second tape clamping portion, so that when the left and right fastener elements are engaged, the slide fastener Sufficient meshing strength that can withstand use can be obtained stably, and even if the fastener tape is folded with the left and right fastener elements engaged, the occurrence of chain cracks can be reliably prevented.

  In addition, since the maximum value of the dimension in the tape length direction in the second head is set to 95% or less of the maximum value of the dimension of the second tape clamping portion, for example, the left and right fastener elements are slid by sliding the slider. When meshing, the meshing operation can be performed smoothly.

FIG. 1 is an enlarged perspective view of a main part of a slide fastener according to a first embodiment of the present invention. FIG. 2 is a top view of the fastener element as viewed from the front of the slide fastener. FIG. 3 is a bottom view when the fastener element is viewed from the back of the slide fastener. FIG. 4 is a side view of the fastener element as viewed from the lower side in the tape length direction. FIG. 5 is a view when the fastener element is viewed from the first and second head sides. FIG. 6 is a front view illustrating a state in which the left and right fastener elements of the slide fastener in Embodiment 1 are engaged with each other. 7 is a cross-sectional view taken along line VII-VII shown in FIG. FIG. 8 is a cross-sectional view showing a state when a slide fastener in which left and right fastener elements are engaged is bent. FIG. 9 is a perspective view showing a fastener element according to a modification of the first embodiment. FIG. 10 is a side view showing a fastener element used for a slide fastener according to Embodiment 2 of the present invention. FIG. 11 is a side view showing a fastener element used for a slide fastener according to Embodiment 3 of the present invention. FIG. 12 is a front view showing a slide fastener having a conventional fastener element made of synthetic resin. FIG. 13 is a front view showing another slide fastener having a conventional fastener element made of synthetic resin. 14 is a cross-sectional view taken along line XIII-XIII shown in FIG. FIG. 15 is an enlarged perspective view of a main part showing still another slide fastener having a conventional synthetic resin fastener element.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to the embodiments described below, and various modifications are possible as long as they have substantially the same configuration as the present invention and have the same effects. Is possible.

  FIG. 1 is an enlarged perspective view of a main part of the slide fastener according to the first embodiment. 2 is a top view of the fastener element, FIG. 3 is a bottom view of the fastener element, FIG. 4 is a side view of the fastener element, and FIG. 5 is the first and second heads of the fastener element. It is a figure when it sees from the side. Further, FIG. 6 is a front view of the slide fastener according to the first embodiment, and FIG. 7 is a cross-sectional view taken along the line VII-VII shown in FIG.

  In the following description, the tape length direction of the fastener tape is defined as the front-rear direction, the tape width direction of the fastener tape is defined as the left-right direction, and the tape front / back direction of the fastener tape is defined as the vertical direction. Regarding the fastener element, in order to easily understand the characteristics of the present invention, the tape length direction (front-rear direction) is described as the element width direction, and the tape width direction (left-right direction) is referred to as the element length direction. Sometimes described.

  As shown in FIGS. 1 and 5, the slide fastener 1 of the first embodiment includes a pair of left and right fastener tapes 2, and a plurality of synthetic resin rows arranged on opposite tape side edges of the fastener tape 2. Fastener elements 10 and a slider (not shown) for engaging and separating the left and right fastener elements 10.

  Each of the left and right fastener tapes 2 has a core portion 2a that swells in the vertical direction of the fastener tape 2 at the opposite tape side edges, and the plurality of fastener elements 10 are formed along the core side edges of the core portions 2a. Are injection-molded at regular intervals to form the element row 3.

  The fastener element 10 according to the first embodiment is formed by injection molding a thermoplastic synthetic resin such as polyamide, polyacetal, polypropylene, or polybutylene terephthalate. The fastener element made of the synthetic resin thus obtained is used. 10 becomes lighter than a metal fastener element.

Further, the fastener element 10 includes an element upper half portion 11 arranged on the first surface side which is the outer surface of the fastener tape 2 and an element lower half portion arranged on the second surface side which is the back surface of the fastener tape 2. 21. The upper half portion 11 of the fastener element 10 has a first tape sandwiching portion 12 that sandwiches a tape side edge portion of the fastener tape 2 with a later-described second tape sandwiching portion 22 of the element lower half portion 21; A tapered first head 13 is provided extending outward from the first tape clamping portion 12.

  The first tape clamping portion 12 has an element width dimension set to a predetermined size at an end edge portion (lower end portion) on the side in contact with the fastener tape 2 in order to secure the fixing strength with the fastener tape 2. Yes. In this case, the element width dimension in the lower end part of the 1st tape clamping part 12 is set to the magnitude | size similar to the element width dimension which the conventional synthetic resin fastener elements have, for example. For example, when sufficient fixing strength with the fastener tape 2 can be obtained, it can be set smaller than the conventional element width dimension and, if necessary, set larger than the conventional element width dimension. It is also possible to do.

  Further, the first tape sandwiching portion 12 in the upper half portion 11 of the element and a part of the first head 13 on the first tape sandwiching portion 12 side include a front side surface and a rear side surface of the element upper half portion 11. A taper portion 14 is provided from the lower end edge of the upper half portion 11 of the element to the upper surface of the upper half portion 11 of the element. In this case, the front side surface and the rear side surface of the element upper half portion 11 in which the taper portion 14 is arranged are formed as curved surfaces having a small curvature as shown in FIG. In the present invention, the front side surface and the rear side surface can be formed in a flat plane.

  In the first embodiment, the taper angle θ2 of the tapered portion 14 that is inclined with respect to the vertical direction of the element as shown in FIG. 5 is set to 10 °. Since the taper part 14 has such a taper angle θ2, the dimension in the tape length direction (that is, the element width dimension) on the upper surface of the first tape holding part 12 is as shown in FIGS. 2 and 5, for example. The maximum value W2 of the dimension in the tape length direction on the upper surface of the first tape holding part 12 is the maximum value W1 of the dimension in the tape length direction of the first tape holding part 12 (that is, the lower end of the first tape holding part 12). Can be set to be smaller than 70% of the element width dimension). In the case of the first embodiment, the maximum value W2 is set to approximately 62% of the maximum value W1. Thereby, when the slide fastener 1 of the present Example 1 is seen from the front side, the form of each synthetic resin fastener element 10 fixed to the fastener tape 2 can be seen as a metal fastener element. it can.

  The first head 13 in the upper half 11 of the element extends to the tip of the lower half 21 of the element, and is joined to the first tape clamping part 12 of the first head 13. It is formed in a tapered shape in which the dimension in the tape length direction gradually decreases from the base end portion toward the tip end. Since the first head 13 extends to the tip of the lower half portion 21 of the element, the appearance of the fastener element 10 can be brought close to a metal fastener element. Further, even when the fastener elements 10 are engaged with each other even when the fastener elements 10 receive a force in the tape front and back direction (push-up force), the engagement of the fastener elements 10 is prevented from being easily disengaged. The state can be maintained.

  Further, the first head 13 is disposed on the element distal end side from the first narrow portion 13a via the inflection portion 13c from the first narrow portion 13a disposed on the first tape holding portion 12 side. The first narrow portion 13a includes, for example, a side edge at the base end of the first head 13 and a side edge at the tip of the first head 13. Is formed so as to swell outward from the straight line, and the second narrow width portion 13b is formed to be recessed inward from the straight line.

  Thus, by providing the 1st narrow part 13a and the 2nd narrow part 13b in the 1st head 13, the external appearance of each fastener element 10 can be made still closer to a metal fastener element. In addition, in the first head 13, for example, a head formed so that the element width dimension gradually decreases at the same rate from the base end portion toward the tip end portion (the head as indicated by a dotted line in FIG. 2). ), The element width dimension of the second narrow portion 13b from the tip of the first head portion 13 to the inflection portion 13c is small, so that the slide fastener 1 of the first embodiment is adjacent as described later. When the element upper half portions 11 are bent in a direction in which the element upper half portions 11 approach each other (see FIG. 8), it is possible to more reliably prevent the first head 13 from interfering with the element upper half portion 11 on the meshing counterpart side. .

  Further, in the first head 13, for example, the first head 13 is formed from the inflection portion 13 c in comparison with the head formed so that the element width dimension gradually decreases at the same rate from the base end to the tip. For example, when the left and right fastener elements 10 are engaged with each other, the fastener element 10 receives a push-up force from the lower side to the upper side. However, the second narrow head portion 24 can be more reliably supported by the first narrow width portion 13a, and the meshing state of the fastener element 10 can be stably maintained.

  Further, in the first embodiment, as shown in FIG. 2, the internal angle θ3 at the distal end portion (second narrow portion 13b) of the first head 13 is set to 20 °, and the first head 13 It is formed in the curved surface shape where the front-end | tip of chamfered. Thereby, the external appearance of the fastener element 10 can be brought close to a metal fastener element, and the aesthetics of the fastener element 10 can be improved.

  In the present invention, the internal angle θ3 of the tip of the first head 13 refers to the first head when the tip of the first head 13 is formed in a curved shape as in the first embodiment, for example. An extension line is drawn along the front side surface and the rear side surface of the portion where the element width dimension decreases at a constant rate on the tip end side of 13, and indicates the angle inside the intersection of these extension lines.

  Further, in the element upper half portion 11 of the first embodiment, a thin-wall start portion 15 is set, which starts decreasing the vertical dimension of the fastener element 10 toward the tip of the first head 13. A thin portion 16 in which the height dimension of the fastener element 10 in the vertical direction is smaller than the height dimension of the fastener element 10 in the thin-wall start portion 15 from the thin-wall start portion 15 to the distal end side of the first head 13 will be described later. It is formed as an interference avoidance part.

  In the first embodiment, the thin-wall start portion 15 has a length L2 in the tape width direction (element length direction) from the tip of the first head 13 to the thin-wall start portion 15 and is the length dimension of the fastener element 10 as a whole. It is set at a position that is 45% of L1.

  The thin-wall start portion 15 can be set at an arbitrary position where the length dimension L2 is 45% or more of the length dimension L1, depending on the shape of the fastener element 10 or the like. When the left and right fastener elements 10 are meshed with each other, the portion 15 is more than the tip of the first head 13 on the mating counterpart side when the left and right fastener elements 10 are meshed. It is particularly preferable that the fastener element 10 is set at a position on an end edge on the first tape holding portion 12 side (that is, an end edge opposite to the first head 13 side of the first tape holding portion 12).

Furthermore, the thin portion 16 of the first embodiment has a downward inclined surface 17 that is inclined downward so as to gradually reduce the vertical dimension of the fastener element 10 from the thin start portion 15 to the tip of the first head 13. doing. In this case, the inclination angle θ1 at which the descending inclined surface 17 is inclined with respect to the upper surface on the inner side of the tape with respect to the thin-wall start portion 15 in the element upper half portion 11 is set to 20 °.

  Thereby, in the fastener element 10 of the first embodiment, for example, as shown in FIG. 4, the height dimension H2 of the fastener element 10 at the tip of the first head 13 is set at the position where the thin-wall start portion 15 is arranged. It can set so that it may become 80% or less of the height dimension H1 of the fastener element 10 in. The height dimension H2 is set to be larger than 50% of the maximum value H1 because the first head 13 is extended to the tip of the lower half portion 21 of the element with a required thickness as described above. Is done. Actually, in the case of the first embodiment, the height dimension H2 is set to about 75% of the maximum value H1.

  The element lower half 21 in the fastener element 10 of the first embodiment is formed integrally with the element upper half 11. The lower half portion 21 of the element has a predetermined tape length dimension and a second tape clamping portion 22 for clamping the tape side edge portion of the fastener tape 2 between the first tape clamping portion 12 and the first tape clamping portion 12. 2 A neck portion 23 extending from the tape clamping portion 22 toward the outside of the tape and constricted in the longitudinal direction of the tape, and extending from the tip of the neck portion 23, and enormously extending in the longitudinal direction of the tape And a second head 24.

  Further, in the lower half portion 21 of the element, as shown in FIGS. 2 and 5, the maximum value W3 of the dimension in the tape length direction in the second head portion 24 is the tape length direction in the second tape clamping portion 22. Is set to 88% of the maximum value W1. Thereby, when the left and right fastener elements 10 are engaged, a sufficient engagement strength that can withstand the use of the slide fastener 1 is stably obtained, and the engagement operation when the left and right fastener elements 10 are engaged is smoothly performed. be able to.

  Furthermore, in the fastener element 10 of the first embodiment, a step portion 18 a as shown in FIG. 4 is provided at the boundary portion 18 between the element upper half portion 11 and the element lower half portion 21. The height dimension of the part on the fastener tape 2 side from the step part 18a is set larger than the part on the element tip side from the step part 18a.

  By providing such a step portion 18a and increasing the height dimension of the lower half portion 21 of the element on the side of the fastener tape 2 from the step portion 18a, for example, a slider (not shown) is slid, as shown in FIG. When the left and right fastener elements 10 are engaged, a gap 8 as shown in FIG. 7 is provided between the first head 13 of the upper half 11 of the element and the second head 24 of the fastener element 10 on the engagement counterpart side. be able to. For this reason, when the left and right fastener elements 10 are engaged, even if the relative height positions of the left and right fastener elements 10 are shifted in the element guide path of the slider, for example, the engagement operation of the fastener elements 10 is smoothly performed. Can be done.

  In the slide fastener 1 of the first embodiment, since the plurality of synthetic resin-made fastener elements 10 having the above-described configuration are arranged on the tape side edge portion of the fastener tape 2, the slide fastener 1 is provided. When viewed from the front, the appearance of the fastener element 10 can be made to look like a metal fastener element. For this reason, the slide fastener 1 can look stylish or give a stylish impression, and has excellent appearance quality and design.

Furthermore, the slide fastener 1 has the thin portion 16 as described above formed in the element upper half portion 11 of the fastener element 10. Thereby, when the fastener tape 2 is bent in a direction in which the upper half portions 11 of the elements approach each other in a state where the left and right fastener elements are engaged, the fastener tape 2 is bent to a smaller radius of curvature than the conventional one. Since the thin-walled portion 16 functions as an interference avoiding portion, as shown in FIG. 8, the first head 13 of each fastener element 10 and the element upper half 11 on the mating counterpart side are prevented from interfering with each other. can do.

  Here, for example, assuming that the thin portion 16 as in the first embodiment is not provided in the upper half portion 11 of the element, in this case, the height position of the upper surface of the first head 13 is thin. It becomes the same as the height position of the upper surface of the position where the start part 15 is arranged. For this reason, when the fastener tape 2 is folded in a direction in which the upper halves of the elements approach each other in a state where the fastener elements are engaged, the first head of the upper half of the element and the upper half of the element on the mating counterpart side And the interfered portion serves as a fulcrum and rotates in a direction in which the element lower half portions 21 of the adjacent fastener elements on the meshing counterpart side are separated from each other. As a result, there is a problem in that the gap between the second heads 24 of the fastener elements is greatly widened, the left and right fastener elements are disengaged, and chain breakage occurs.

  On the other hand, in the slide fastener 1 of the first embodiment, since the thin portion 16 functions as an interference avoidance portion by providing the thin portion 16 in the element upper half portion 11 of the fastener element 10, as described above. When the fastener tape 2 is bent, the element upper half 11 adjacent to the mating counterpart is not interfered with the first head 13 of the fastener element 10 without interfering with the element upper half 11 of the mating counterpart. It is possible to make contact at the front side edge and the rear side edge on the upper surface side. As a result, the adjacent second heads 24 on the engagement partner side can be prevented from separating until the engagement of the fastener element 10 is released, and the engagement state of the fastener element 10 can be stably maintained. The problem of cracking can be solved.

  As described above, the slide fastener 1 according to the first embodiment has the appearance that the fastener element 10 is lighter than the metal fastener element and has an excellent appearance quality like the metal fastener element. Moreover, even if the slide fastener 1 is bent to the curvature radius smaller than the conventional one in the direction in which the upper half portions 11 of the fastener tape 2 approach each other when the left and right fastener elements 10 are engaged, It becomes a high-quality slide fastener that is functionally superior.

  In the slide fastener 1 according to the first embodiment, the taper portion 14 of the element upper half 11 is arranged on the first tape clamping portion 12 and a part of the first head 13 on the first tape clamping portion 12 side. ing. However, in the present invention, the taper portion 14 of the element upper half 11 only needs to be disposed at least in the first tape clamping portion 12, and for example, FIG. As described above, the first head portion 13 ′ is not provided with the tapered portion 14, and the first head portion 13 ′ has a vertical cross-sectional shape corresponding to the shape of the upper surface thereof. It is also possible to form the front side surface and the rear side surface as notched. Also by this, the appearance of the fastener element 10 'can be finished like a metal fastener element, and the same effect as the fastener element 10 of the first embodiment can be obtained.

FIG. 10 is a side view showing a fastener element used for a slide fastener according to Embodiment 2 of the present invention.
In addition, the slide fastener according to the second embodiment and the slide fastener according to the third embodiment to be described below are different from the slide fastener 1 according to the first embodiment described above in the form of the upper half of each fastener element. The configuration is substantially the same as that of the first embodiment. Therefore, in the present Example 2 and Example 3 described later, the same members as those described in Example 1 are denoted by the same reference numerals, and the description thereof is omitted.

  The upper half portion 31 of the fastener element 30 according to the second embodiment includes a first tape holding portion 32 that holds the tape side edge portion of the fastener tape 2 between the second tape holding portion 22 and the first tape. And a taper-shaped first head 33 extending outward from the clamping portion 32, and the first tape clamping portion 32 and the first tape clamping portion of the first head 33. A tapered portion 34 is provided in a part on the 32 side as in the first embodiment.

  Further, in the upper half portion 31 of the element, a thin-wall start portion 35 that starts to decrease the height dimension of the fastener element 30 toward the tip of the first head 33 is formed from the tip of the first head 33 to the thin-wall start portion 35. The dimension L2 in the tape width direction is set at a position that is 45% of the length dimension L1 of the entire fastener element 30, and from the thin-walled start portion 35 to the distal end side of the first head 33, The thin portion 36 is formed as an interference avoidance portion.

  The thin portion 36 of the second embodiment includes a first downward inclined surface 37a that is inclined downward from the thin-wall starting portion 35 toward the tip of the first head 33, and the first head 33 than the first downward inclined surface 37a. And a second downwardly inclined surface 37b having an inclination angle θ1 ′ larger than the inclination angle θ1 of the first downwardly inclined surface 37a.

  In this case, the inclination angle θ1 of the first downward inclined surface 37a is set to 20 °, and the inclination angle θ1 ′ of the second downward inclined surface 37b is set to 40 °. Accordingly, in the second embodiment, the height dimension H2 of the fastener element 30 at the tip of the first head 33 is approximately 62 of the height dimension H1 of the fastener element 30 at the position where the thin-walled start portion 35 is disposed. % Is set to a size.

  The slide fastener according to the second embodiment having such a fastener element 30 is lighter than the metal fastener element and has an excellent appearance quality like the metal fastener element. .

  Moreover, in the same manner as the slide fastener of the first embodiment, the slide fastener 30 can be used even when the fastener tape 2 is folded in the direction in which the upper half portions 31 of the elements approach each other in the engaged state of the left and right fastener elements 30. Since the thin-walled portion 36 provided in the portion functions as an interference avoiding portion, it is possible to prevent the occurrence of chain breakage and stably maintain the meshing state.

FIG. 11 is a side view showing a fastener element used for a slide fastener according to Embodiment 3 of the present invention.
The element upper half 41 of the fastener element 40 according to the third embodiment includes a first tape clamping portion 42 and a tapered first head 43, and the first tape clamping portion 42 and the first tape clamping portion 42 A taper portion 44 is provided on a portion of the first head 43 on the first tape clamping portion 42 side, as in the first embodiment. Further, a thin-wall start portion 45 is set at the same position as in the first and second embodiments in the upper half portion 41 of the element, and the thin-wall portion extends from the thin-wall start portion 45 to the distal end side of the first head 43. 46 is formed as an interference avoiding portion.

  The thin-walled portion 46 of the third embodiment includes a downwardly inclined surface 47 that inclines downward from the thin-walled start portion 45 toward the distal end of the first head 43, and is closer to the distal end side of the first head 43 than the downwardly inclined surface 47. And a flat surface 48 arranged. In this case, the inclination angle θ1 of the downward inclined surface 47 is set to 40 °. In addition, the height dimension H2 of the fastener element 40 at the tip of the first head 43 is set to approximately 76% of the height dimension H1 of the fastener element 40 at the position where the thin-wall start portion 45 is disposed. Yes.

  The slide fastener of the third embodiment having such a fastener element 40 is also light and has an excellent appearance quality like a metal fastener element as in the first and second embodiments. In addition, even when the fastener tape 2 is folded in the direction in which the upper half halves 41 of the left and right fastener elements 40 are engaged, the occurrence of chain cracking is prevented and the engagement state is stably maintained. Can do.

DESCRIPTION OF SYMBOLS 1 Slide fastener 2 Fastener tape 2a Core part 3 Element row | line | column 8 Gap | interval 10,10 'Fastener element 11 Element upper half part 12 1st tape clamping part 13, 13' 1st head 13a 1st narrow part 13b 2nd narrow width Part 13c Inflection part 14 Tapered part 15 Thin start part 16 Thin part 17 Downward inclined surface 18 Boundary part 18a Step part 21 Element lower half part 22 Second tape clamping part 23 Neck part 24 Second head part 30 Fastener element 31 Element upper half part Part 32 first tape clamping part 33 first head 34 taper part 35 thin-walled start part 36 thin-walled part 37a first downward inclined surface 37b second downward inclined surface 40 fastener element 41 element upper half part 42 first tape clamping part 43 first 1 head 44 taper 45 thin-wall start 46 thin-wall 47 descending slope 48 flat Surface H1 Height dimension of the fastener element at the position where the thin-wall starting portion is arranged H2 Height dimension of the fastener element at the tip of the first head L1 Length dimension of the entire fastener element L2 Start of thinning from the tip of the first head Dimension in the tape width direction up to the portion W1 Maximum value in the tape length direction in the first and second tape clamping portions W2 Maximum value in the tape length direction in the upper surface of the first tape clamping portion W3 Second head Maximum value in the tape length direction at θ1, θ1 ′ Inclination angle of descending inclined surface θ2 Taper angle θ3 Inner angle of tip of first head

Claims (9)

A pair of left and right fastener tapes (2) and a plurality of synthetic resin fastener elements (10, 10 ', 30, 40) arranged on opposite side edges of the fastener tape (2). The fastener elements (10, 10 ', 30, 40) include an element upper half (11, 31, 41) disposed on the first surface side of the fastener tape (2) and the fastener tape (2 ) On the second surface side, and the element upper half portion (11, 31, 41) is a first tape clamping portion having a predetermined length in the tape length direction. (12, 32, 42) and the first tape clamping portion (12, 32, 42) extending outward from the tape to the tip of the lower half (21) of the element, and tape toward the tip A taper-shaped first head (13, 13 ', 33, 43) whose lengthwise dimension gradually decreases, and the lower half (21) of the element includes the first tape clamping part (12, 32, 42) (2) a second tape clamping part (22) for clamping the tape, and a neck part extending from the second tape clamping part (22) toward the outside of the tape and constricted in the longitudinal direction of the tape length ( 23) and a slide fastener (1) having a second head (24) extending from the front end of the neck (23) and enlarging front and rear in the tape length direction,
The first head (13, 13 ', 33, 43) includes a first narrow portion (13a) disposed on the first tape clamping portion (12, 32, 42) side and the first narrow width. A slide fastener comprising: a second narrow portion (13b) disposed on the tip side of the element from the portion (13a) through the inflection portion (13c).   The upper half (11, 31, 41) of the element is in a state where the left and right fastener elements (10, 10 ', 30, 40) mesh with each other, and the fastener tape (2) , 31,41) interference between the first head (13,13 ′, 33,43) and the upper half (11,31,41) of the mating counterpart when bent in the direction in which they approach each other So that the second heads (24) adjacent to each other on the meshing partner side are separated from each other until the meshing is disengaged, the first head (13,13 ', 33,43) The slide fastener according to claim 1, further comprising an interference avoidance portion for avoiding interference with the upper half portion (11, 31, 41) of the element.   The interference avoidance portion is located on the first head (13,13 ′, 33,43) side from the thin-walled start portion (15,35,45) set in the upper half (11,31,41) of the element, A thin wall portion (16, 36, 46) in which the height dimension in the vertical direction of the fastener element (10, 10 ', 30, 40) is smaller than the height dimension in the thin wall start portion (15, 35, 45). The slide fastener according to claim 2, which is formed by having the slide fastener.   The thin-walled portion (16, 36, 46) extends from the thin-walled start portion (15, 35, 45) toward the tip of the first head (13, 13 ′, 33, 43). , 10 ', 30, 40) The slide fastener according to claim 3, further comprising a downward inclined surface (17, 37a, 37b, 47) inclined downward so as to gradually reduce the height dimension.   Inclination angle of the downward inclined surface (17, 37a, 37b, 47) with respect to the upper surface on the tape inner side of the thin-walled start portion (15, 35, 45) in the upper half portion (11, 31, 41) of the element ( The slide fastener according to claim 4, wherein θ1) is set to 15 ° or more and less than 90 °.   The height dimension (H2) of the fastener element (10, 10 ', 30, 40) at the tip of the first head (13, 13', 33, 43) is the thin-walled start portion (15, 35, 45). 4. The slide fastener according to claim 3, wherein the slide fastener is set to be larger than 50% and not larger than 80% of the height dimension (H1) of the fastener element (10, 10 ′, 30, 40) at a position where) is disposed.   The dimension (L2) in the tape width direction from the tip of the first head (13, 13 ′, 33, 43) to the thin-walled start portion (15, 35, 45) is the fastener element (10, 10 ′, The slide fastener according to claim 3, wherein the slide fastener is set to 45% or more of the entire length dimension (L1).   The slide fastener according to claim 1, wherein an inner angle (θ3) at a distal end portion of the first head (13, 13 ', 33, 43) is set to 30 ° or less.   The second narrow portion (13b) is formed on the side edge of the base end of the first head (13, 13 ', 33, 43) and on the first head (13, 13', 33, 43). The slide fastener according to claim 1, wherein the slide fastener is formed so as to be recessed inward from the straight line when the side edge at the tip is connected by a straight line.

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